My 1997 Dodge Roadtrek RV with 133,000 miles on 5.2 engine is idling +/- 1000RPM and the check engine light came on. One scan left the mechanic scratching his head, stating, "Let's turn the CEL off and see what happens . . . . . "
Besides look for a new mechanic, thoughts or recommendations? Research tells me 5-600 RPM is the norm.

THANKS!

 

rough idling is caused by a dirty IAC valve... search on this forum... there is a sticky on how to clean it... even if you don't have rough idle, it might be a good thing to get in there and clean it anyway... not a difficult job... also possibly a throttle position sensor...

if you get codes coming up( CEL) light again then go to Advance Auto or any auto parts store and have them read the codes for you and post them on here

 

FYI...The images are gone from that post and I don't think it's a sticky.
But here's the link to the post anyways. https://dodgeforum.com/forum/dodge-r...n-the-iac.html

 

Thanks guys. The idle is not sporadic, hot or cold it purrs about 1000rpm, as does the engine at speed, with no fluctuations. That said, I will still look into cleaning or replacing the IAC.

 

You have a large vacuum leak.

 

THANK YOU. I am inclined to agree. Any suggestions as to where to start the search?!?!?

Hope your Christmas day surpasses your expectations :-)

 

There is a metal plate that bolts to the bottom of the intake. The seal around the plate has been know to give out when the plate warps (designed too thin). The test is to Remove the PVC valve, plug it's hose and also plug the hose in the valve cover. Then remove the dipstick and connect a vacuum gauge there. Run the engine and see if you get vacuum at the dipstick. You should see a few PSI of pressure building due to ring blow-by, so if you get vacuum it means the plate is leaking and the intake has to come off.